Improvement in sewing-machines



2 Sheet heet 1' D. W. REY,

SEWING MAG E I No. 36,617. Patented 0m. 7, 1862.

V Z. v fizz/6n 0% 2 Sheets-Sheet 2.

D. W. G. HUMPHREY SEWING MACHINE.

No. 36,617. Patented Oct, '7, 1862.

UNITED STAT S PATENT OFFICE.

'lMPROVEMENT IN SEWING-MACHINES- Specification forming part of LettersPatent No. 36,6l7, dated October 7, 1862.

To all whom it may concern:

Be. it known that I, D. W. G. HUMPHREY, of

Chelsea, in the county of Suffolk and State of same, reference being badto the annexed drawings, making a part of this specification, inWilsch-- Figure 1 is a perspective view with the side of the arm removedfor the purpose of showing the internal arrangement of the parts. Fig. 2shows the opposite sides of the part removed from the arm with thetension arrangement attacll'ecl. Fig. 3is a perspective view of theunder side of the table.- Figs. 4, 5, and 6 show how the threads areinterlooped to form the stitch. Fig. 7 isa section of the table with theplate V and the cam-wheel W, Fig. 8, removed. Fig. 8 shows the upperface of the cam-wheel 'W and groove by which the teedclamp is moved.Fig. 9 shows the under face [of the cain wheel W and groove whichoperates rocker X. Fig. 10 is a section of the feed mechanism. Fi 11 isan under side view of thc'feedclamp K Fig. 12 is a view of the apperside of feed-clamp K A, Fig. 1, is the table; B, the arm; 0, theneedle-bar carrier; D, the needle-bar, and E a horizontal shaft, onwhich is the balancewheel F and the crank-wheel G, which drives to theneedle-bar carrier 0 a lateral motion, by

which the needle a'is carried alternately through and over theedgeot'the material worked upon. I is a slottedcam attached to,theneedle-bar.

In this cam a pin on the face ofthe cam-wheel' G works, thus giving theneedle-bar the proper.

vertical motion. .0 is a thread-guide attached I to cam 1. K is theclamp-presser. h is'a latch by which the clamp-Presser is raised. c,Fig. 2,isathread-guide and tension, through the upper eye of which.passes the thread from v the spool d", thence around the wire accordingto the tension required, and through-the lower eye, thence through theeye ofthe threadclamp e, hereinafter described, through the eye of thethread-guide 0', then through the eye in the lower end of theneedle-bar, and through the eye of the needle a. f on theinner sideofFig. 2 is a. spring which holds the thread-clamp c. When the plate shownin Fig. 2 is screwed onto the arm in its place the point of thethreadclamp at e is intermittently operated upon to relieve the threadby cam g, attached to hub of bevel-gear on shaft'H. The thread-clampe isa hollow screw with a piston working within it. The screw is turned by awrench into the side of the arm, as shown in the plate at the right,Fig. 2. *On the outward end of the piston is a shoulder which, to clampthe thread, is drawn against the face of the screw by the spring f,attached near to the end of the piston, which is operated upon by cam g,as described. The eye at the'c'lamp through which the thread passes isthrough the piston close motion The points m and it work alternately andenterthe loops from opposite directions.

It is held in its place by the cap hf. over which it slides, having alateral motion produced y the slot S working on the pin 'r,Fig. 4. M,

Fig. 3, is a. bar carrying the lower needle, I), forv thebinding-thread, and receives motion from a cam on shaft H. N is a barcarrying hook c for spreading the loop of the binding-thread; It alsooperates the loop-check i, Fig. 4,-a-nd receives motion from cam onshaft B. M and N are connected to cap R by the sweeps jand Z,Fig. 5,which give the needle and hook a.

the eye of the needle 11, thence up through the plate V. 1 7

F1 g. 4 represents the stitch produced by the mechanism" hereindescribed, and, together with Figs. 5 and 6, shows the operation of theparts in producing it. Fig. 4, needle a carries.

a loop of the finishing-thread through the cloth, which loop is enteredbythe point it of the loop-carrier. (t then retreats, leaving its loopon point a, Fig. 5. The loop-carrier moves farther forward, and at thesame time laterally far enough to receive the needle a as 1t'de-.

scends over the edge of the cloth and through the loop on point a at z.The loop-checki holds the loop in a position to insure the passage ofneedle a through it. As soon as needie a carries a loop over the edge ofthe cloth and through the-next preceding loop, which was carried throughthe cloth, the loop-check z and the loop-carrier d retreat, leaving theloop carried through the cloth over needle a, and tree to be drawn up atthe next descent of the needle. The needle a then continues its descentover the edge, forming another loop,

which is entered by the point m of loop-carrier, Fig. 6. The needle I),Fig. 4; then passes a looplof the binding-thread through the overedgeloop, point m and needle a. then retreat, leaving a loop of thefinishing-thread over needle 1;. Hook 0 seizes the loop of thebindingthread and holds it open until needle a carries another loopthroughthe cloth and enters its point into this loop of thebinding-thread,when the needle I) withdraws from the over-edge loop andat the same time the hook Q releases its'hold upon the binding-thread,leaving its- .piece U hinged to it. Through these the cam Q moves thecam-wheel, Fi 8, coming in con- Iactwith it through the slot 2 Fig. 7.After the sliding piece U, Fig. 10, which is held against the cam-wheelby a spring around the standard, which connects it to lever T, has movedthe canrwheel forward, the noise which would be occasioned by allowingit to come in contact with the teeth ot'cam-wheel while moving back isprevented by the loop-carrier d, Fig. 5, which moves it away from theteeth, and against the end of which it slides back to its place. Fulcrumof lever T is at 8 e is a spring which keeps the end of level forwardthatit may come in contact with cam Q. This cam works against lever T atpoint y". 'Z. Fig. 3., isa screw for regulating the feed. Whenfeeding-the rounded part of the button-hole the cam-wheel must movefaster than when feeding the straight parts of it, else the stitcheswill he too much crowded'in the rounded part. The necessary change offeed is produced as follows: Y Fig. 3, is an adjustable plate at;

.tached to lever T, and'is fastened to the lever by screws throughslots,'thatit may be moved farther from or nearer to cam Q, by which thefeed of the rounded. part may be regulated. Through Y-the piston eworks. YVhile feeding the rounded part of the piston e is dropped downforward of 3 coining nearer to cam Q and in contact withit, thusgivingmore vibration to lever T. Piston e is raised and de-' pressed bythe arm of rocker X. Rocker Xis operated upon by the groove'in the underside of cam-wheel, Fig. 9. Whe'n stitching the straight part of thebutton-hole point to of rocker, Fig. 10, rests in the groove on theunder side of cam-wheel. \Yhen stitching the rounded part it is raisedto the surface, thus raising and depressing piston e at the proper timeto effect the changes of feed. Spring'r keeps rocker X in contact withthe cam-wheel. Arm of rocker Xshould be made of thin plate or with ajoint in it, that it may yield to the vibration of lever T. Handle W onthe endaot' lever T is for the purpose of operating the feed withoutmoving any other partot' the machine.

Fig. 7, l is the recess of the table A in which the cam-wheel W worksaround the col. lar q as its axis. f f are pawls. .2 is a slot throughwhich the slide U moves the camwheel. When the cam-wheelis placed intothe recess and in proper position to commence work that point of itsgroove marked m should rest directly under point n of Plate V, Fig. 1..

Fig. 11 is the under side of the feed-clamp. The use of this clamp is tohold the cloth or other materialto be stitched. By clamping two or morethicknesses in thisway their edges are held even and smooth through theprocess of feeding; neither side of the cloths being directly acted uponby feed or friction to draw or displace them. The inner or holdingsurfaces or the clamp may be rough or smooth, as the material workedupon may require.

Fig. 12 is an upper view of the feed-clamp. The upper and lower platesare held in their relative position by the arms of the upperplate fittedto the'slots in the standards 25 of the under plate. as is a springriveted at the middle to the upper plate. its ends bend downward andrest upon the lower plate, thus rais- "ing the end of the plate to whichit isattached and making a. stronger pressure on the cloth when theplates are pressed together by the "'leverp c is a slot through theclampand I through which the needle works. This slot should belongenough for the longest buttonhole, and its width in .,the lower plateshould The rim e on the upper plate, when feeding,

through the round part of the button-hole. comes in contact with thepresser-wheel, which keeps the edge of thelow'er plate closeto thecircular projection d. This rim is notnecessary in working a straightbutton-hole, in which I case the slot 0 should not he. enlargedattheend. To place the clamp on the machine in position to commence work,raise the needle to its highest point also raisethe clamp-presser. Thenplace the clamp under, so that slot 0 shall rest over the circularprojection d, and that the pin a on the under side of theclamp shalldrop through the slot in plate V at point a" and into the groove of thecam-wheel at W. As

' thecam-wheel is moved forward theclamp,

guided by the-slot in plate V, is fedalon g in a, straight line whileone side of the button-hole is being stitched. As thepin a ofclampenters the circular part of theslotin plate Vit reaches that pointof the groove in the cam-wheel nearest to its center and there restsuntil the wheel has fed it through the circular part of the slot whilethe rounded part of the button-hole is being stitched. \Vhile the pin a.is passing through the'circular part of the slotit is movedforwardinjcontact with a point on slide k of cam-wheel and at the pointwhere it enters the other straight part of the slot there is a recess inthe collar q, Fig. 7, aroundwhich the camwheel works. Into thisrecessthe'end of slide it is pressed by the pin a, leaving the grooveopen until .the slide It has passed'. forward of pin a. The cam-wheelthen carries the pin a through they other straight part of slot in plateV while the other sile of the button-hole is being stitched. Thefeed-clamp may then be removed, "leaving the cam-wheel in the sameposition as at the beginning. To make ashorter button-hole. than wouldbe made by starting the pin at point m. as described, feed the clampalong byoperating withthehand the lever T at W until that pointeisbro'ughtunder the needle where it is desirable to commence.

What 1 claim as my invention, and desire to secure by Letters Patent,is-- 1 The needle-bar carrier 0, operated as described, whereby aregular lateral motion is imparted to needle a, carrying it alternatelythrough and over the edge of the material worked upon to form anedge-finish or buttonhole stitch.

2. The combination of the needle-bar carrier 0, the loop-carrierd,needle b,hook c, and-loop check '5 with needle 11., arranged andoperated as described, whereby the button-hole stitch represented isproduced.

. 3. The cam-wheel W, employed to feed the material to be stitched, whensuch material is held and directed by or acted upon through plates,clamps, or their equivalents, the said cam-wheel being moved by anysuitable mechanism.

4. The slotted plate V. 'for the purpose of giving directiontothefeed-clamp in stitching any iornrot' but on-hole, in combinationwith the cam-wheel W for the purpose of moving the said feed-clamp, botharranged and operating substantially as specified.

. .5. Thefeed-clamp K, constructed substantially as described, for thepurpose of .holding the material to he worked upon while it is being fedand directed by the cam-wheel W9, in combination with the slottedplateV, or by any other suitable mechanism.

' 6. Theenipl -iyment of the rocker X, piston 6 adjustable-plate Y andspring r, in combination with the lever T, operated as and for thepurpose specified.

n. W. e. HUMPHREY.

Witnesses: v

ALFRED R. STANLEY, SAMUEL ()RGUT.

